[HISTORY: Adopted by the Board of Selectmen of the Town of Groton 12-14-1998. Amendments noted where applicable.]
Driveways shall be designed to provide adequate access for emergency vehicles and shall meet the following minimum standards.
Traveled widths shall be a minimum of 10 feet. Shoulders shall be a minimum two feet in width. Shoulders shall have a two-percent cross-sectional slope. Shoulders shall not be impeded by obstructions (e.g., light poles, mailboxes, trees, tree limbs, shrubs, etc.). A minimum of one shoulder shall pitch away from the driveway to direct stormwater runoff off of the driveway.
The center-line grade for any driveway shall not be less than 0.75% nor greater than 10%. The driveway intersection with a traveled way shall provide a leveling area not to exceed three-percent grade from the edge of the traveled way for a minimum distance of 30 feet. The driveways shall be graded to not create low points within the driveway that will create puddling/icing conditions.
The proposed center-line of the driveway shall not be greater than seven feet above or below the existing grade.
Slopes abutting driveways shall not exceed 3:1 in fills and 2:1 in cuts. Rip-rap slopes are allowed at a 1:1 slope. Vertical retaining walls are also allowed. Guardrails may be required by the Board of Selectmen or its designee.
Driveways with slopes greater than 5% shall be constructed of three inches of bituminous concrete placed in two lifts. Driveways with slopes less than 5% do not have to specify surface cover. All driveways shall be of three inches of bituminous concrete for a minimum of the first 20 feet or longer, if so directed by the Board of Selectmen, or its designee, from the driveway intersection. Concrete driveways shall be allowed as authorized by the Board of Selectmen, or its designee, as directed by the Highway Surveyor, provided that the concrete driveways provide an adequate friction surface to mitigate skidding conditions.
The stormwater runoff from all impervious areas shall not discharge into the public right-of-way. The peak rate of runoff at the street shall not increase from the predeveloped rate during the two-, ten-, twenty-five- or one-hundred-year storm event, unless an increase is authorized by the Board of Selectmen, or its designee. Stormwater runoff may discharge directly into rights-of-way of new subdivision roads if the overall stormwater management plan for the street is designed to accommodate the runoff and a catch basin is located within 10 feet of the downslope side of the driveway. The purpose is to prevent ice jams in the winter.
Driveways shall be located and designed so as to minimize conflict with traffic on public streets and to provide visibility and sight distances which are safe and adequate for observation of approaching vehicles and pedestrian traffic. Driveways on the same side of the street shall not be located within 100 feet of the edge of an existing driveway or 100 feet from the point of tangency of a roadway intersection along the road that the lot has frontage unless authorized by the Board of Selectmen, or its designee. A minimum sight distance in all directions shall be provided as follows:
Pull-off areas for emergency vehicles shall be provided on driveways a minimum of every 200 feet. The pull-off areas shall be constructed of material capable of supporting emergency vehicles.
Strict compliance with the requirements of these regulations may be waived when, in the judgment of the Board of Selectmen, or its designee, such action is in the public interest and not inconsistent with the Code of the Town of Groton.
The Board of Selectmen shall hear appeals of denials of permits by its designee.
The permit application must be approved or denied within 15 calendar days by the Board of Selectmen, or its designee.